Not that they care but this is factually incorrect, the bill does not guarantee seamless trade within the UK.

And just wait until they find out who voted for the treaty that guaranteed there wouldn't be seamless trade across the UK. https://twitter.com/Conservatives/status/1311027739911229440

Also not exactly a tweet to scream "we really want a deal with the EU". Fortunately tweets like this will only be seen in the UK... https://twitter.com/Conservatives/status/1311027739911229440?s=20

Reading between the lines the UK probably have moved a little in negotiations, but not yet enough. Suspect the positive briefings from end last week were based on UK government overconfidence as to how EU would respond https://amp.theguardian.com/politics/2020/sep/29/brexit-brussels-rebuffs-new-uk-proposals-on-state-subsidies?CMP=share_btn_tw&__twitter_impression=true

Must be strong temptation now on EU side to say we're happy to keep talking but no agreement can be reached until the UK government drops the threat to breach the existing treaty?

As well as threatening international law worth noting the Internal Market Bill is opposed by all the devolved governments, which particularly in Scotland is going to strengthen arguments for the break up of the UK.